Which acid is used in soft drinks? (A) Acetic acid (B) Carbonic acid (C) Sulfuric acid (D) Hydrochloric acid Answer: (B)
Which element forms the highest number of compounds? (A) Hydrogen (B) Nitrogen (C) Carbon (D) Oxygen Answer: (C)
The bond formed between two non-metals is usually – (A) Ionic (B) Metallic (C) Covalent (D) Hydrogen Answer: (C)
The purest form of carbon is – (A) Coal (B) Charcoal (C) Coke (D) Diamond Answer: (D)
The name of HNO₃ is – (A) Hydrochloric acid (B) Sulfuric acid (C) Nitric acid (D) Nitrous acid Answer: (C)
Which gas is known as laughing gas? (A) N₂O (B) CO (C) NO (D) NO₂ Answer: (A)
The substance that gives sour taste to curd is – (A) Acetic acid (B) Lactic acid (C) Formic acid (D) Citric acid Answer: (B)
Soap is a salt of – (A) Fatty acid and base (B) Carbohydrate (C) Protein (D) Alcohol and acid Answer: (A)
The metal used in galvanization is – (A) Iron (B) Zinc (C) Lead (D) Tin Answer: (B)
Which of the following is a diatomic molecule? (A) CO₂ (B) CH₄ (C) O₂ (D) H₂O Answer: (C)
The property of metal to be hammered into sheets is – (A) Ductility (B) Elasticity (C) Malleability (D) Sonority Answer: (C)
The best conductor of electricity among metals is – (A) Aluminum (B) Copper (C) Gold (D) Silver Answer: (D)
An example of exothermic reaction is – (A) Melting of ice (B) Boiling of water (C) Neutralization (D) Photosynthesis Answer: (C)
Which is a homogeneous mixture? (A) Smoke (B) Salt water (C) Air with dust (D) Soil Answer: (B)
Which salt gives a violet color in flame test? (A) NaCl (B) KCl (C) CaCl₂ (D) BaCl₂ Answer: (B)
Which vitamin contains cobalt? (A) Vitamin B₁ (B) Vitamin B₆ (C) Vitamin B₁₂ (D) Vitamin C Answer: (C)
The molecular mass of water is – (A) 16 u (B) 18 u (C) 17 u (D) 20 u Answer: (B)
Which of the following is not an allotrope of carbon? (A) Graphite (B) Charcoal (C) Diamond (D) Lime Answer: (D)
Which one is a chemical change? (A) Melting of wax (B) Boiling of water (C) Digestion of food (D) Cutting of paper Answer: (C)
The solution which resists change in pH is called – (A) Neutralizer (B) Buffer (C) Electrolyte (D) Indicator Answer: (B)
Which indicator turns red in acid? (A) Phenolphthalein (B) Methyl orange (C) Bromothymol blue (D) Universal indicator Answer: (B)
Atomic mass of an element is due to – (A) Protons only (B) Electrons only (C) Neutrons only (D) Protons and neutrons Answer: (D)
Which gas is used in welding? (A) Hydrogen (B) Methane (C) Acetylene (D) Ethane Answer: (C)
Permanent hardness of water is due to – (A) Ca(HCO₃)₂ (B) Mg(HCO₃)₂ (C) CaSO₄ and MgSO₄ (D) CO₂ Answer: (C)
Which compound is used as an antifreeze? (A) Glycerol (B) Ethanol (C) Methanol (D) Ethylene glycol Answer: (D)
The unit of molar concentration is – (A) mol (B) g/L (C) mol/L (D) kg/mol Answer: (C)
Which is an acidic oxide? (A) CO₂ (B) Na₂O (C) CaO (D) MgO Answer: (A)
The gas that causes acid rain is – (A) CH₄ (B) SO₂ (C) CO₂ (D) NH₃ Answer: (B)
The test for presence of starch is – (A) Blue-black with iodine (B) Red with litmus (C) Cloudy with silver nitrate (D) Effervescence with acid Answer: (A)
Which of the following is hygroscopic? (A) NaCl (B) CaO (C) Na₂CO₃ (D) Conc. H₂SO₄ Answer: (D)
Which type of bond is found in NaCl? (A) Covalent (B) Ionic (C) Hydrogen (D) Coordinate Answer: (B)
Which oxide is neutral? (A) N₂O (B) CO (C) SO₂ (D) Cl₂O Answer: (B)
The atomic number of neon is – (A) 10 (B) 20 (C) 18 (D) 8 Answer: (A)
The bleaching action of chlorine is due to – (A) Formation of nascent hydrogen (B) Formation of nascent oxygen (C) Formation of HCl (D) Formation of O₂ Answer: (B)
The group of periodic table with maximum electronegativity is – (A) Group 1 (B) Group 2 (C) Group 17 (D) Group 18 Answer: (C)
Which gas burns with a pop sound? (A) Oxygen (B) Hydrogen (C) Nitrogen (D) Carbon dioxide Answer: (B)
The ore of mercury is – (A) Bauxite (B) Galena (C) Cinnabar (D) Magnetite Answer: (C)
The chemical name of washing soda is – (A) Sodium chloride (B) Sodium hydroxide (C) Sodium carbonate (D) Sodium bicarbonate Answer: (C)
The pair that represents isomers is – (A) Ethane and Ethene (B) Propanol and Propanone (C) Methanol and Ethanol (D) Butane and Pentane Answer: (B)
Which acid is found in grapes? (A) Tartaric acid (B) Oxalic acid (C) Formic acid (D) Malic acid Answer: (A)
Which metal is most abundant in Earth’s crust? (A) Iron (B) Aluminum (C) Magnesium (D) Calcium Answer: (B)
The test for chlorine gas is – (A) Turns red litmus blue (B) Turns blue litmus red (C) Turns starch iodide paper blue-black (D) Turns moist starch paper blue Answer: (C)
Which gas is used in food packaging? (A) O₂ (B) CO₂ (C) N₂ (D) Cl₂ Answer: (C)
Which of the following is a metalloid? (A) Phosphorus (B) Boron (C) Calcium (D) Chlorine Answer: (B)
Atomicity of ozone (O₃) is – (A) 2 (B) 1 (C) 3 (D) 4 Answer: (C)
The number of neutrons in carbon-14 is – (A) 6 (B) 8 (C) 7 (D) 14 Answer: (B)
Which gas is evolved when metal reacts with acid? (A) CO₂ (B) NH₃ (C) H₂ (D) O₂ Answer: (C)
Which is the lightest metal? (A) Sodium (B) Potassium (C) Lithium (D) Magnesium Answer: (C)
Who discovered the neutron? (A) J.J. Thomson (B) Rutherford (C) Chadwick (D) Bohr Answer: (C)
Which solution has pH < 7? (A) NaOH (B) HCl (C) NH₄OH (D) KOH Answer: (B)
